Bug 1298839 (CVE-2016-1904)

Summary:	CVE-2016-1904 php: heap buffer overflow in escapeshell functions
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, dmcphers, fedora, jialiu, jokerman, jorton, kseifried, lmeyer, mmaslano, mmccomas, rcollet, sardella, tiwillia, webstack-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-01-22 20:21:16 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1298843
Bug Blocks:	1298833

Description Andrej Nemec 2016-01-15 09:07:46 UTC

There exist a heap-based buffer overflow that allows one to write a user
tainted data past an allocated buffer. This vulnerability lies in the
following functions:

escapeshellarg
escapeshellcmd

On a default php installation, the memory limit is set to 128MB and this
vulnerability is not triggerable. The analysis shows that this is
triggerable when memory limit is roughly > 1024mb.

Upstream bug:

https://bugs.php.net/bug.php?id=71270

Original report with reproducer:

http://seclists.org/oss-sec/2016/q1/98

CVE assignment:

http://seclists.org/oss-sec/2016/q1/100

Patch:

https://github.com/php/php-src/commit/2871c70efaaaa0f102557a17c727fd4d5204dd4b

Comment 1 Andrej Nemec 2016-01-15 09:09:00 UTC

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1298843]

Comment 2 Remi Collet 2016-01-15 09:20:10 UTC

This patch affects PHP 7, so none of the available PHP version in RHEL or RHSCL is affected.

Comment 3 Tomas Hoger 2016-01-22 20:21:16 UTC

Apparently introduced in:

https://github.com/php/php-src/commit/70ddc853fd4757004ac488e6ee892897bb6f395a

As noted in comment 2, this did not affect any PHP version as shipped in Red Hat Enterprise Linux and Red Hat Software Collections.